CHICAGO—If the Detroit Lions are going to dig out of their 2-4 hole, they’ll have to do it without the help of locker-room leader and No. 2 receiver Nate Burleson.

Burleson broke his right leg in the second half of Monday’s 13-7 loss to the Bears and will miss the rest of the season. He injured the leg when he landed awkwardly on his only catch of the game and clutched it in obvious pain immediately after he fell to the ground.

From a talent standpoint, the Lions seem well-equipped to make up for Burleson’s loss, though the candidates haven’t played that way this year. The team spent second-round picks on receivers each of the last two seasons, but had little in the way of production from Titus Young (a 2011 draft pick out of Boise State) and Ryan Broyles (a 2012 pick from Oklahoma) before Monday.

Young now moves into the No. 2 spot, though he’s been one of the team’s biggest disappointments after a strong training camp. Broyles caught the first three passes of his career Monday. The Lions had been bringing him along slowly after he tore his ACL last November.

Burleson’s loss is big from an emotional standpoint as well. He routinely gives pre- and post-game speeches and is considered the glue of the offense.

Also Monday, the Lions took another hit to their thin secondary when safety Amari Spievey suffered his second concussion in less than a year. Spievey also suffered a concussion in the Lions’ wild-card loss to the New Orleans Saints last year. He tried playing through that brain injury, and wasn’t fully healthy until midway through the Lions’ offseason program.

Spievey, who just regained his starting job earlier this month, almost certainly will miss Sunday’s game against the Seahawks as the Lions have typically held out players with concussions at least one week. Erik Coleman played the second half Monday and likely will start in Spievey’s place.